8
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Can I dry my own yeast to make it relatively shelf stable? How?
How did Monks and farmers do it? Farmers in Norway apparently do it with even less fanfare. http://www.garshol.priv.no/blog/342.html
Terje took some wort in a plastic bucket. Then he brought out ...
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8
votes
Accepted
Will reused yeast change beer taste?
we can get away with re-using yeast, because Mutation isn't instantaneous, it take multiple generations to change a whole batches properties. Also bigger brewers use a "mother culture" to grow more ...
- 1,769
7
votes
How long does it take for yeast to mutate into having other characteristics?
Yeast follow the laws of natural selection.
As a cell is budding the new mass may have some minor defects / mutations. If those changes give the yeast an advantage to survive it will get passed on.
...
- 18.5k
6
votes
Culture yeast from bottles
Sure, there's no reason you can't do this. Realistically, though, since you're talking about a beer you've brewed yourself, there are other times in the process where it is much easier to collect ...
- 6,417
5
votes
Accepted
Can I wash yeast with tap water or starsan?
Washing yeast with Starsan will kill most of the yeast. Just like it kills off other microbes in your equipment when you sanitize.
All stored yeast should really be used within a few weeks. I ...
- 36.2k
4
votes
Accepted
Questions on keeping a yeast strain going over and over
'So what exactly is 4 - 6 generations? [...] Are all of those considered generation 2?'
A generation of yeast is considered as having gone from pitching to post-fermentation collection. So if you ...
- 6,417
4
votes
What's the best method of storing yeast for 4 to 6 months in the refrigerator?
Just do it
Nothing you described is needed or beneficial with modern liquid yeast packages. For example Weast's Activator:
The Activator™ package was designed with superior UV light- and oxygen-...
- 3,718
3
votes
Can I dry my own yeast to make it relatively shelf stable? How?
This all looks a bit like gobbledygook if you ask me.
The intention is not to dry yeast commercially, simply for the home brewer.
Norweigien Kveik has been dried at home for centuries, how do you ...
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2
votes
How many times can yeast be reused?
Generally you will have few commercial brewers that will reuse it more than 5 or 6 times with out re-culturing; and re-scaling up a starter. Ignoring mutation it could theoretically last for ever, but ...
- 7,018
2
votes
Yeast washed, combine containers?
If you practice good sanitation.
Decant the water off and combine to save space.
- 18.5k
2
votes
is my cider infected or is this normal for safaleUS05
Yes, but expect the same results.
Sounds like a wild yeast that doesn't flocculate and stays in suspension.
If it tastes good then use it.
- 18.5k
2
votes
Chunky yeast Safeale-05 safe to pitch?
Looks fine, and it is smells fine and the beer off it has no off flavours then you should be good to go.
I guess the yeast looks a bit odd because usually you would get a wide shallow yeast cake that ...
- 7,018
2
votes
Culture yeast from bottles
Yes, that's perfectly fine, however the best way to conserve a strain of yeast that you already have on hand is by making an oversize starter and saving a portion of it or slanting the yeast. this way ...
2
votes
Culture yeast from bottles
I've done it, so it's definitely possible. You just have to bear some caveats in mind.
How many batches have been fermented with the yeast? Remember that some strains tend to mutate faster than ...
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2
votes
Reusing yeast yes/no and how much?
The generally specified amount is about 1/3 of a cup of yeast slurry into a 20 litre/5 gallon batch - so maybe 25ml, more?. This is all very rough, because you can never be sure of the concentration ...
- 2,060
2
votes
Accepted
Pitching stressed yeast cake (Wit)
The esters which provide the banana aroma are only formed at the start of the fermentation, when the yeast grows and multiplies. And indeed underpitching is part of this.
However, after your first ...
- 3,655
2
votes
Pink (or salmon) colored colonies on foam in starter flask
I suspect that the source of the infection was glycerin I used, since I perhaps erroneously assumed it should be sterile from a previously unopened container. I found citations that Sporobolomyces in ...
- 257
1
vote
Accepted
How to preserve an open box of dried yeast?
Lallemand states:
...must be stored dry, below 4˚C (39˚F). Exposure to humidity and
oxygen will affect the viability and vitality of the yeast. Do not use
soft packs or sachets that appear to have ...
- 1,773
1
vote
How long does it take for yeast to mutate into having other characteristics?
There is no set time and no set form that the mutation will take. But in general, mutations take a long time to happen. Years is the time line often cited.
- 33.4k
1
vote
Accepted
Total Yeast Cell Count
If you are combining the starters you have:
0.34B/mL @ 6L = 2040 Billion
1.46B/mL @ 1L = 1460 Billion
Total Yeast Cells Combined = 3500 Billion @ 7L
After combining the starters, cold crashing will ...
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1
vote
Chunky yeast Safeale-05 safe to pitch?
That's just well flocculated yeast.
Just break it up the best you can by agitating. Even if there's still clumps the outer yeast will feed and break away and disperse as they produce cO2.
- 18.5k
1
vote
Chunky yeast Safeale-05 safe to pitch?
As long as there no off-flavours, should be safe to repitch. It's not just yeast in the cake, but also hot&cold break etc.
- 1,498
1
vote
Accepted
is my cider infected or is this normal for safaleUS05
Vomit taste is butyric acid,
produced by anaerobic bacteria such as Clostridium butyricum, C. kluyveri, and Megasphaera spp 1 during glucose fermentation
I would not recommend re-using the yeast. ...
- 2,178
1
vote
is my cider infected or is this normal for safaleUS05
IMHO it is not worth trying to reuse a Saf05 yeast that has been fermenting in questionable circumstances. The yeast is too cheap to buy to risk an infection or even a failure. More over it is not ...
- 5,631
1
vote
Can I wash yeast with tap water or starsan?
If tap water is safe to use or not will depend on who you ask and where in the world they live. I'd seek advice about that locally.
Around where I live pretty much everyone I know just use straight ...
- 318
1
vote
Can ale yeast be used weeks after it's opened (Safale S-04)?
I use 1/5 of packet of S-04 per 4L brew and so far it has been in the fridge for 3 months and still works fine. I always hydrate it in 200ml of boiled water cooled to 35 Celsius with cling film on top,...
- 111
1
vote
Can I dry my own yeast to make it relatively shelf stable? How?
I found excellent guidance provided at the following link on how to dry yeast in your oven. Basically, since your oven is one of the most sterile locations in your house (and even if it is not, it ...
- 3,417
1
vote
Harvesting yeast
There are no doubt yeast cells throughout it, but if you're going to pitch from that, you should use the topmost white stuff below the liquid. All of the slurry below the liquid should be fine, but ...
- 2,829
1
vote
Can I dry my own yeast to make it relatively shelf stable? How?
You can make stocks of your yeast in glycerol and put them in the freezer for relatively long term storage and work with Petri dishes in the fridge for shorter storage time. You can make a glovebox ...
- 106
1
vote
Should I ferment a new batch directly on the yeast cake generated by the previous batch?
I have done this in the past, it was with a low temp lager yeast. The fermenting process remains sterile if you sterilise properly to start with, so if you siphon the wort off the yeast with sterile ...
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